maps.me has been pretty good - they occasionally try various ways of monetizing it (the most recent one seems to be some kind of limit on map downloads) but it was a pretty straightforward OSM viewer with basic routing and searching.
Thanks - just replaced maps.me (no, Lemmy, that's not a URL!) with organic maps.
It sounds like maps.me might have gone through a few changes of ownership? The latest "update" comes a lot closer to breaking its core functionality than previous attempts.